COMPOSTED GREEN WASTE - ITS INFLUENCE ON GRAPE PHYLLOXERA IN UNGRAFTED VINEYARDS
Grapevine phylloxera, through its root-feeding activity, causes significant root damage to ungrafted European grapevines Vitis vinifera. Resistant rootstocks are considered the primary long-term management option. In Australia, phylloxera is considered a major pest risk due to the planting predominance of ungrafted susceptible V. vinifera. In recent years, following reports of rootstock breakdown in Europe, alternative management options including cultural control have been considered. A field-based study was conducted over three consecutive grapevine growing seasons, in the cool climate King Valley region of North east Victoria, Australia. The trial quantified the effect of annual applications of composted green waste on the population dynamics and risk of dispersal of grapevine phylloxera (genotype G4) on ungrafted V. vinifera Sauvignon Blanc. Biennial root assessments, taken in winter and late summer, of root-galling populations of phylloxera were not significantly affected by application of composted green waste. However, phylloxera first instar emergence above-ground and subsequent movement of dispersive stages onto the grapevine trunk were significantly higher on compost treated grapevines. The effect of green waste compost on grapevine vigour, yield and grape quality was also quantified. Although both grape yield and pruning weights progressively declined from season to season the decline was not related to treatment. The implications of these results, for phylloxera management on ungrafted V. vinifera grapevines, in cool-climate growing regions is discussed.
Powell, K.S., Burns, A., Granett, J., McGourty, G. and Norng, S. (2007). COMPOSTED GREEN WASTE - ITS INFLUENCE ON GRAPE PHYLLOXERA IN UNGRAFTED VINEYARDS. Acta Hortic. 733, 135-142
grapevine, Daktulosphaira vitifoliae, population dynamics, quarantine, mulch, compost, dispersal